What is the wavelength range of visible light?
About 400 nm to 750 nm.
What is a ray of light in optics?
The straight-line path light travels when wavelength is small compared to objects.
What lies in the same plane during reflection at a spherical mirror?
The incident ray, reflected ray, and normal at the point of incidence.
What is the formula relating focal length and radius of curvature for a spherical mirror?
The focal length equals half the radius of curvature , .
Light wavelength range
400 to 750 nm
Ray of light
Straight-line light path
Speed of light
Approximately 3 × 10^8 m/s
Mirror focus
Point where reflected rays converge
Focal length formula
f = R/2 for spherical mirrors
Mirror equation
1/v + 1/u = 1/f
Magnification formula
m = -v/u for spherical mirrors
Answer 11 questions on Ray Optics and Optical Instruments.
1. Which description best defines light in terms of its electromagnetic wavelength range?
2. What path does a ray represent when the wavelength of light is small compared with ordinary objects?
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